Electrical Maintenance 8-10
Strator
The stator assembly consists of three individual windings terminated in the delta-type connections. Using an ohmmeter or test
lamp, check for winding continuity between leads A, B, and C. There should be no continuity from any lead to point D
(laminations). Also, stators showing signs of winding discolouration should be discarded
Diode Plate Assembly
The diode plate assembly consists of two plates, each containing three diodes. Both plates are mounted on a plastic insulator thus
making a diode plate assembly. The plate with the B+ terminal contains the positive diodes and the other plate contains the
negative diodes. When testing the diodes, the positive and negative diodes are tested separately.
Using an ohmmeter or diode tester, check for continuity as follows:
1. Place the negative lead of the meter on G. Place the positive lead of the meter on A, B, and C. There should be continuity
from G to A, B, and C.
2. Place the positive lead of the meter on G. Place the negative lead of the meter on A, B, and C. There should be no continuity
from G to A, B, or C.
3. Place the positive lead of the meter on H. Place the negative lead of the meter on D, E, and F. There should be continuity from
H to D, E, and F.
4. Place the negative lead of the meter on H. Place the positive lead of the meter on D, E, and F. There should be no continuity
from H to D, E, or F.
Alternator Assembly
1. Connect the stator windings to the diode plate.
Solder the three leads of the stator windings to the diode plate if either is to be replaced.
Rotor
1. Bearings (2)
2. Slip Rings
3. Pole Fingers (Rotor Body)
Testing Stator — Stator Resistance Values
Alternator A to B A to C B to C A, B, C to
D
23 amps
37 amp
65 amp
.21 ohm*
.32 ohm**
.11 ohm**
.21 ohm*
.32 ohm**
.11 ohm**
.21 ohm*
.32 ohm**
.11 ohm**
None
None
None
*20.0°C **25.0°C
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